The cousins are alike in age，but ________ they are as different as day and night.

A football suddenly flew over our head and it ______ missed hitting a child playing nearby.

The president of the university has been ___ for two years.

Professor Smith has written some novels, but he is _____ known for his plays. 

(2013·大连24中模拟)Good health is the basis for students to ________ carry on with their studies and to do any other activity.